Physics Work: What is work

The video tutorial explains the concept of work in physics, highlighting its specific definition compared to everyday understanding. It introduces the work equation, which is the product of force and distance, and emphasizes that work is only done when an object moves. The tutorial also covers the importance of force direction and components, using examples to illustrate these concepts. Finally, it discusses the unit of work, Joules, and its relevance in physics.

What is the key difference between the everyday and physics definitions of work?

• In everyday life, work is defined as any physical activity.

• In physics, work is defined as force times distance.

• In everyday life, work is always enjoyable.

• In physics, work is done only when an object is lifted.

Which of the following is true about the formula for work in physics?

• Work is the product of velocity and time.

• Work is the product of mass and acceleration.

• Work is the product of force and distance in the same direction.

• Work is the product of force and time.

Why is no work done when holding a bowling ball steady in your hand?

• Because no force is applied.

• Because the ball is too heavy.

• Because the ball is moving too fast.

• Because the ball does not move any distance.

How do you calculate the component of force in the direction of motion when force is applied at an angle?

• Multiply force by tangent of the angle.

• Multiply force by sine of the angle.

• Multiply force by cosine of the angle.

• Multiply force by the angle itself.

What is the significance of the cosine function in calculating work when force is applied at an angle?

• It gives the angle of the force.

• It gives the y projection of the force.

• It gives the x projection of the force.

• It gives the total force applied.

What is the unit of work in physics?

• Pascal

• Newton

• Joule

• Watt

Which of the following statements is true about work and movement?

• Work is done only if the object is lifted.

• Work is done only if the object is pushed.

• Work is done even if the object does not move.

• Work is done only if the object moves.